Abstract
To investigate the effects of acute whole body vibration (WBV) intervention on body balance, neuromuscular performance and perceived exertion two types of vibration platforms were compared: vertical platform (VP) and oscillating platform (OP). Forty-four healthy college students (35 men and nine women) were exposed on different days to two types of WBV platforms (VP and OP). Electromyography activity (EMG) of six muscle groups was recorded while standing in squat position on the vibrating platform during five 1-min sets. Balance, maximal voluntary isometric contraction (MVIC), and rating of perceived exertion (RPE) were recorded immediately after the WBV exposure. The OP protocol induced a significantly higher change in balance than VP protocol, as shown by variations in displacement area of the centre of pressure (+25.5% versus –5.5% for OP and VP, respectively). Moreover, RPE scores were significantly higher during OP than VP (+13.2%; P<0.05). No changes were observed concerning MVIC. WBV exposure induces changes in static body balance, these changes being larger when the vibratory stimulus is provided by an OP in comparison to a VP. Moreover, the perceptual response is higher with the OP. Aspects related to direction of vibration or amplitude could explain this acute effect.
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